Many Thanks SoCal, just what I needed.
I'll probably have a J2 visa and I intend to check with TSA re clearance as their position appears to be to require the checks if the training is going to increase your competence, e.g. PPL to CPL or IR. It's going to be Savannah Ga, Home to Hard Hearted Hanna and a ramp full of rather tasty bizjets.
Mike